Twister stop motion



Nov. 3, 1931. R. HARGREAVES TWISTER STOP MOTION Filed Oct; 28,

1929 2 Sheets-Sheet l INVENTOR.

BY I 3 ATTORNEYS.

Filed Oct. 28, 1929 2 Sheets-Sheet 2 '1 N VEN TOR.

ATTORNEY-s Patented Nov. 3, 1931 UNITED STATES PATENT OFFICE ROBERTHARGREAVES, OF WHITINSVILLE, MASSACHUSETTS, ASSIGNOR T WHITIN MACHINEWORKS, OF WHITINSVILLE, MASSACHUSETTS, A CORPORATION OF MASSA- CHUSETTSTWISTED. STOP MOTION Application filed. ()ctober 28, 1929.

This invention relates to machines for twisting yarn or thread.Mechanism has been heretofore provided 1n such machmes for stopping thefeed to a particular spindle upon breakage of its twisted yarn or threador of any strand thereof.

It is the object of my present invention to improve the construction ofsuch stop motion mechanism by providing a device through which the stopmotion is rendered effective to stop the rotation of the spindle at thesame time that the feed of the yarn is interrupted.

My invention further relates to arrange- :nents and combinations ofparts which will be hereinafter described and more particularly pointedout in the appended claim.

A preferred form of the invention is shown in the drawings in which Fig.1 is a sectional side elevation of parts of a twisting machine embodyingmy improvements Fig. 2 is a sectional plan view, taken along the line 22in Fig. 1;

Fig. 3 is a sectional side elevation, taken along the line 33 in Fig. 2;and

Fig. 4 is a plan view of a modified construction.

Referring to the drawings, I have indicated a portion of the frame 10 ofa twisting machine, said frame supporting a spindle rail 12 on which aplurality of spindles S are mounted in the usual manner. Strands of yarnY are drawn from a creel (not shown) 35 and pass under a guide-rod 14,through a guide-wire 15, over a roll 16, around a pressure roll 17 andguide-rod 18, and over an additional roll 19 to a traveler 20 on a ring22'mounted on a ring-rail 24 which is reciprocated vertically bysuitable lifting mechanism, not shown.

The pressure roll 17 is provided with gudgeons or hearing portions 26rotatable in open bearings 27 at the upper end of a supporting member28. The member 28 is secured to the upper end of a sliding rod 30 andthe lower end of the rod 30 is connected by an oifset member 31 to alower sliding rod 32. The rod 30 is guided vertically in a Serial No.402,824.

bearing 33 and the rod 32 is guided in a bearing 34. r v

A weight W is supported on a belt 36, passing over a guide pulley 37 andconnected to a collar 38 clamped on the rod 30. The weight W thus tendsto lift the pressure roll 17 out of engagementwith the constantlyrotated feed rolls 16 and 19.

A latch 40 is pivoted at 41 on the supporting'member'28 and engages theunder side of a stop plate 42 whenever the latch 40 is moved downwardwith the member 28. Such engagement retains the member 28 in loweredposition, with the roll 17 in free engagement with the feed rolls16 and19.

Yarn-controlled mechanism is provided for disengaging the latch 40 andpermitting the weight W to raise the pressure roll 17. For this purpose,a slide 50 is mounted in guide- Ways in a stand 51 on the frame 10 andhas a portion 52 projecting upward adjacent a rotating shaft 54 on whichcams 55 are mounted. Drops 56 are slidably mounted in the portion 52 ofthe stand 50 and are each provided with a hoolcshaped -portion at theirupper end adapted to engage one of the strands of yarn Y between theguide rod 14 and the guide-wire 15.

Each of these drops 56 is provided with a laterally projecting portion60 which will be engaged by the cam 55 when the yarn breaks and the dropdescends to its lower position. Such engagement will cause the cam topush the slide 50 outward, so that a projecting portion 62 of the slidewill engage the lower end of the latch 40 and free it from the stopplate 42. The weight W is then free to raise the rod 30' and member28and thus separate the roll 17 from the feed rolls 16 and 19.

An additional stopping member 65 is mounted on a lever 66 pivoted at 67on the stand 50 and having an inward extension 68 also supporting asliding bar in the portion 52 of the slide 50. If the thread T'breaks,the member 65 swings upward and the portion 68 thereof moves downward,bringing the corresponding sliding member into po ition for engagementby the cam 55 and disengaging the latch 40 as previously described.

The details of construction of the stop motion as above described formin themselves no part of my present invention, which relates moreparticularly to the provision of a device for stopping the spindle asthe roll 17 is lifted.

Each spindle is provided with a whirl 70 mounted on the spindle bladeand having 2. depending flange 71 (Fig. 3). A brake 74 is pivoted at 75on a support 76 which is clamped between the spindle rail 12 and thespindle base 77. The brake 74 is preferably provided with a leather orfibre facing 78, for engagement with the flange 71 of the spindle whirl.A cam 80 is pivoted at 81 in hearings in the support 76 and is sopositioned that it will engage a projection 82 on the outer face of thebrake "4. A spring plunger 83 engages a lug 84 on the brake 74 and actsto yieldingly move the brake away from the spindle. V

A crank arm 86 is formed integral with the cam 80 and has a stud 87which extends through a slot 88 in the connecting member 31, between theends of the rods and 32.

As the rods move upward upon release by the stop motion, the arm 86 isswung upward, forcing the cam 80 against the brake 74c and causing thesame to exert braking pressure on the flange '71 of the spindle whirl 7O.

A pedal 90 (Fig. 1) is 'ecured to the lower part of the rod 32 so thatthe operator can depress and re-set the mechanism by pressing his footon the pedal 90. i The resulting downward movement of the rods 30 and 32K releases the brake 80 and brings the latch 40 into position forre-engagement with the stop plate 42.

I have thus provided mechanism by which the rotation of the spindle istopped at the same time that the feed of the yarn is interrupted. Thisis very desirable, as otherwise the thread between the feed rolls andthe ring will receive an excessive amount of twist.

In Fig. 4, I have indicated an arrangement similar to that shown in Fig.2, but having a handle 100 by which the cam 101 may be forced manuallyagainst the brake 102. I thus provide convenient means for stopping aselected spindle manually at any desired time.

Having thus described my invention and the advantages thereof, I do notwish to be limited to the details herein disclosed, otherwise than asset forth in the claim, but what I claim is In a spinning or twistingmachine, a spindle having a driving whirl with a circumferential flangethereon. a base for said spindle, means to feed strands of fibrousmaterial to said spindle, a brake positioned to engage said flange andpivoted to swing about an axisparall-el to said spindle, said brakehaving anextended segmental surface engaging a substantial part of theperiphery of said circumferential flange, a support secured in fixedrelation-to the spindle base and on which said brake is pivoted, ahorizontal cam of fibrous material, such vertical movement also actingthrough said crank arm to move said cam shaft and cam angularly andthereby apply the brake to stop the spindle.

In testimony whereof I have hereunto af- HARGREAVES.

fixed my signature.

ROBERT

